I actually think the model is interesting.
When BendingSpoon or IAC acquired an asset, it's meant to be held by them in order to augment their existing portfolio.
M&A isn't the hallmark of PE - restructuring an asset in order to exit out of it at a profit is.
The classic PE monetization strategy is to acquire an underperforming asset, restructure said asset, and then exit the asset at around 20% IRR.
BendingSpoons on the other hand is a holding company that is acquiring and consolidating stagnant but large SaaS platforms into a single mega-platform.
The economics are different as are the operational and organizational structures.
Which isn't exactly what they seem to be doing but also isn't that far off.